1 files changed, 215 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/asn1/asn1-efence-allocator.cpp b/src/VBox/Runtime/common/asn1/asn1-efence-allocator.cpp
new file mode 100644
index 00000000..ed122378
--- /dev/null
+++ b/src/VBox/Runtime/common/asn1/asn1-efence-allocator.cpp
@@ -0,0 +1,215 @@
+/* $Id: asn1-efence-allocator.cpp $ */
+/** @file
+ * IPRT - ASN.1, Electric Fense Allocator.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "internal/iprt.h"
+#include <iprt/asn1.h>
+
+#include <iprt/mem.h>
+#include <iprt/errcore.h>
+#include <iprt/string.h>
+
+
+/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnFree} */
+static DECLCALLBACK(void) rtAsn1EFenceAllocator_Free(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation, void *pv)
+{
+    RT_NOREF_PV(pThis);
+    RTMemEfFreeNP(pv);
+    pAllocation->cbAllocated = 0;
+}
+
+
+/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnAlloc} */
+static DECLCALLBACK(int)  rtAsn1EFenceAllocator_Alloc(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation,
+                                                      void **ppv, size_t cb)
+{
+    void *pv = RTMemEfAllocZNP(cb, RTMEM_TAG);
+    if (pv)
+    {
+        *ppv = pv;
+        pAllocation->cbAllocated = (uint32_t)cb;
+        return VINF_SUCCESS;
+    }
+    RT_NOREF_PV(pThis);
+    return VERR_NO_MEMORY;
+}
+
+
+/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnRealloc} */
+static DECLCALLBACK(int)  rtAsn1EFenceAllocator_Realloc(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ALLOCATION pAllocation,
+                                                        void *pvOld, void **ppvNew, size_t cbNew)
+{
+    Assert(pvOld);
+    Assert(cbNew);
+    void *pv = RTMemEfReallocNP(pvOld, cbNew, RTMEM_TAG);
+    if (pv)
+    {
+        *ppvNew = pv;
+        pAllocation->cbAllocated = (uint32_t)cbNew;
+        return VINF_SUCCESS;
+    }
+    RT_NOREF_PV(pThis);
+    return VERR_NO_MEMORY;
+}
+
+
+/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnFreeArray} */
+static DECLCALLBACK(void) rtAsn1EFenceAllocator_FreeArray(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ARRAYALLOCATION pAllocation,
+                                                          void **papvArray)
+{
+    RT_NOREF_PV(pThis);
+    Assert(papvArray);
+    Assert(pAllocation->cbEntry);
+    Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated);
+
+    uint32_t i = pAllocation->cEntriesAllocated;
+    while (i-- > 0)
+    {
+        RTMemEfFreeNP(papvArray[i]);
+        papvArray[i] = NULL;
+    }
+    RTMemEfFreeNP(papvArray);
+
+    pAllocation->cEntriesAllocated  = 0;
+    pAllocation->cPointersAllocated = 0;
+}
+
+
+/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnGrowArray} */
+static DECLCALLBACK(int) rtAsn1EFenceAllocator_GrowArray(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ARRAYALLOCATION pAllocation,
+                                                         void ***ppapvArray, uint32_t cMinEntries)
+{
+    RT_NOREF_PV(pThis);
+    Assert(pAllocation->cbEntry);
+    Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated);
+
+    /*
+     * Resize the pointer array.
+     */
+    void **papvArray = *ppapvArray;
+    void *pvPointers = RTMemEfReallocNP(papvArray, cMinEntries * sizeof(void *), RTMEM_TAG);
+    if (pvPointers)
+    {
+        *ppapvArray = papvArray = (void **)pvPointers;
+        if (cMinEntries > pAllocation->cPointersAllocated) /* possible on multiple shrink failures */
+            RT_BZERO(&papvArray[pAllocation->cPointersAllocated],
+                     (cMinEntries - pAllocation->cPointersAllocated) * sizeof(void *));
+        else
+            AssertFailed();
+        pAllocation->cPointersAllocated = cMinEntries;
+    }
+    else if (cMinEntries > pAllocation->cPointersAllocated)
+        return VERR_NO_MEMORY;
+    /* else: possible but unlikely */
+
+    /*
+     * Add more entries.
+     */
+    while (pAllocation->cEntriesAllocated < cMinEntries)
+    {
+        void *pv;
+        papvArray[pAllocation->cEntriesAllocated] = pv = RTMemEfAllocZNP(pAllocation->cbEntry, RTMEM_TAG);
+        if (pv)
+            pAllocation->cEntriesAllocated++;
+        else
+            return VERR_NO_MEMORY;
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+/** @interface_method_impl{RTASN1ALLOCATORVTABLE,pfnShrinkArray} */
+static DECLCALLBACK(void) rtAsn1EFenceAllocator_ShrinkArray(PCRTASN1ALLOCATORVTABLE pThis, PRTASN1ARRAYALLOCATION pAllocation,
+                                                            void ***ppapvArray, uint32_t cNew, uint32_t cCurrent)
+{
+    RT_NOREF_PV(pThis);
+    Assert(pAllocation->cbEntry);
+    Assert(pAllocation->cEntriesAllocated <= pAllocation->cPointersAllocated);
+
+    /*
+     * We always free and resize.
+     */
+    Assert(pAllocation->cEntriesAllocated == cCurrent);
+    Assert(cNew < cCurrent);
+
+    /* Free entries. */
+    void **papvArray = *ppapvArray;
+    while (cCurrent-- > cNew)
+    {
+        RTMemEfFreeNP(papvArray[cCurrent]);
+        papvArray[cCurrent] = NULL;
+    }
+    pAllocation->cEntriesAllocated = cNew;
+
+    /* Try resize pointer array.  Failure here is a genuine possibility since the
+       efence code will try allocate a new block.  This causes extra fun in the
+       grow method above. */
+    void *pvPointers = RTMemEfReallocNP(papvArray, cNew * sizeof(void *), RTMEM_TAG);
+    if (pvPointers)
+    {
+        *ppapvArray = (void **)pvPointers;
+        pAllocation->cPointersAllocated = cNew;
+    }
+}
+
+
+/** The Electric Fence ASN.1 allocator. */
+RT_DECL_DATA_CONST(RTASN1ALLOCATORVTABLE const) g_RTAsn1EFenceAllocator =
+{
+    rtAsn1EFenceAllocator_Free,
+    rtAsn1EFenceAllocator_Alloc,
+    rtAsn1EFenceAllocator_Realloc,
+    rtAsn1EFenceAllocator_FreeArray,
+    rtAsn1EFenceAllocator_GrowArray,
+    rtAsn1EFenceAllocator_ShrinkArray
+};
+
+#if 0 && defined(IN_RING3) /* for efence testing */
+RT_DECL_DATA_CONST(RTASN1ALLOCATORVTABLE const) g_RTAsn1DefaultAllocator =
+{
+    rtAsn1EFenceAllocator_Free,
+    rtAsn1EFenceAllocator_Alloc,
+    rtAsn1EFenceAllocator_Realloc,
+    rtAsn1EFenceAllocator_FreeArray,
+    rtAsn1EFenceAllocator_GrowArray,
+    rtAsn1EFenceAllocator_ShrinkArray
+};
+#endif
+